In the following, I will mean by ‘verificationism’ the doctrine according to which understanding a sentence entails that one knows how to verify it, i.e. how to determine its truth value. It is not the only possible meaning of ‘verificationism’, nor perhaps the most common. However, it is with reference to this sense of ‘verificationism’ that I am going to ask the question whether the Tractatus is committed to verificationism.